Input
Key Results
Per‑element Breakdown
| Element | Count | Atomic weight (g/mol) | Contribution (g/mol) |
|---|---|---|---|
| Total (g/mol) | 0.0000 | ||
Example Data
| Click to load | Formula | Description |
|---|---|---|
| Load | H2O | Water |
| Load | NaCl | Sodium chloride |
| Load | C6H12O6 | Glucose |
| Load | CaCO3 | Calcium carbonate |
| Load | Fe2(SO4)3·9H2O | Iron(III) sulfate nonahydrate |
| Load | K4[Fe(CN)6]·3H2O | Potassium ferrocyanide trihydrate |
Formula Used
The molar mass M of a compound is the sum of atomic weights times their stoichiometric counts:
M = Σ (nᵢ × Aᵢ)
- nᵢ: number of atoms of element i in one formula unit.
- Aᵢ: standard atomic weight (g/mol). You may override values.
- Groups in parentheses, brackets, or braces are multiplied by trailing coefficients.
- Hydrates use a middle dot (·) or dot (.) as a separator.
- Leading coefficients multiply the entire following unit or group.
Conversions:
grams = moles × M and moles = grams ÷ M
How to Use
- Enter the chemical formula, including any parentheses, brackets, or hydrates.
- Optionally provide moles or grams to compute related quantities.
- Set decimal places and add any atomic weight overrides if needed.
- Click Calculate to see molar mass and per‑element contributions.
- Export the breakdown using Export CSV or Export PDF.
Tip: You can click rows in Example Data to load sample formulas.
Common Elements Reference
Frequently used elements with average atomic weights (g/mol).
| Symbol | Name | Atomic weight |
|---|
Hydrate Multipliers Cheat Sheet
Mass added by water of crystallization per formula unit.
| Notation | Meaning | Added mass (g/mol) |
|---|
Worked Examples: Molar Mass
Computed using the same parser and weights as the calculator.
| # | Formula | Name | M (g/mol) |
|---|